# purpose: construct list of base 2 digits whose length is user-
#    specified

# want random values, need the random module
import random

# get the number of wanted bits
reply = input('How many bits: ')
n = int(reply)

print()

# keep track of the bits seen so far as a list
bits =[]  # start off with an empty list
options = [0, 1]
for i in range(0, n):  # i is the iterator
    # indent everything that needs to happen in the loop, generate a number and put it in the list
    # each iteration want to add another bit to the list of
    # bits so far

    # get the next bit

    bit = random.randrange(0, 2) # random binary digit, will give you either a 0 or a 1

    bit = random.choice( options ) # another option, pick something from the options list

    # append the bit to the list of bits so far
    bits.append(bit)
    bits = bits + [bit] # another way to add something to a list, combine two lists

# print bits
print(bits)